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Mol Cell Endocrinol. 2002 Jan 25;186(2):175-81.

Paracrine dialogue in implantation.

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  • 1Fundación Instituto Valenciano de Infertilidad para el Estudio de la Reproducción Humana, Guardia Civil 23, 46020 Valencia, Spain.


We know that the implantation process requires a functionally normal embryo at the blastocyst stage and a receptive endometrium, but also a communication link between them is needed. This paracrine dialogue between the embryo, endometrium and the corpus luteum are known to occur in ruminants and primates, more specifically endometrial-embryonic interactions have been reported in rodents and primates but not in humans. This process is a highly regulated mechanism and many molecules take part in this cross-talk. Here, we present updated information in humans on the embryonic regulation of endometrial epithelial molecules such as chemokines, adhesion and anti-adhesion molecules, and leptin during the apposition and adhesion phases of human implantation.

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